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Revision

The authors have revised the author contributions to read: TH proposed the collection
of toenails to permit the chronological comparison for Hg in toenail and head hair,
conducted the toenail-Hg and hair-Hg analyses, and provided the Supplemental Material.
AT was a significant contributor to almost all aspects of this project involving the
Korean and Japanese populations. AMIBS would not have been as successful without her.
AS aided in writing the manuscript. TMB contributed significantly to study design
and data interpretation. EM aided in the writing of the manuscript and contributed
to the acquisition of the data. All authors contributed substantially to the discussion
of the data and their analyses, and provided editorial comments to the draft manuscript.